function PageQuery(q) {
    if(q.length > 1) this.q = q.substring(1, q.length);
    else this.q = null;
    this.keyValuePairs = new Array();
    if(q) {
        for(var i=0; i < this.q.split("&").length; i++) {
            this.keyValuePairs[i] = this.q.split("&")[i];
        }
    }

    this.getKeyValuePairs = function() { return this.keyValuePairs; }
	
    this.getValue = function(s) {
        for(var j=0; j < this.keyValuePairs.length; j++) {
            if(this.keyValuePairs[j].split("=")[0] == s)
                return this.keyValuePairs[j].split("=")[1];
        }
        return false;
    }

    this.getParamIndex = function(param) {
        for(var j=0; j < this.keyValuePairs.length; j++) {
            if(this.keyValuePairs[j].split("=")[0] == param)
                return j;
        }
        return -1;
    }

    this.setValue = function(param, value) {
        for(var j=0; j < this.keyValuePairs.length; j++) {
            if(this.keyValuePairs[j].split("=")[0] == param){
                this.keyValuePairs[j] = param + "=" + value;
                return true;
            }
        }
        this.keyValuePairs[this.keyValuePairs.length] = param + "=" + value;
        return true;
        return false;
    }	

    this.appendValue = function(param, value) {
        for(var j=0; j < this.keyValuePairs.length; j++) {
            if(this.keyValuePairs[j].split("=")[0] == param){
                this.keyValuePairs[j] =this.keyValuePairs[j] + value;
                return true;
            }
        }
        return false;
    }	


    this.removeParam = function(param) {
        var index = this.getParamIndex(param);
        this.keyValuePairs.splice(index, 1);
        return(index);
    }

    this.getParameters = function() {
        var a = new Array(this.getLength());
        for(var j=0; j < this.keyValuePairs.length; j++) {
            a[j] = this.keyValuePairs[j].split("=")[0];
        }
        return a;
    }

    this.toString = function() {
        return this.keyValuePairs.join("&");
    }

    this.getLength = function() { return this.keyValuePairs.length; }
}